layer
英 [ˈleɪə(r)]   美 [ler]  
n.
层;表层;层次;阶层
vt.
把…分层堆放

例句

A thin layer of dust covered everything.

所有的物品上都积了薄薄的一层灰尘。

There were too many layers of management in the company.

这家公司管理层太多。